NM_001845.6:c.651+179A>G

Variant names:

• chr13-110209213-T-C
• rs7333008
• NM_001845.6:c.651+179A>G

Variant summary

Our verdict is Benign. The variant received -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BA1

The NM_001845.6(COL4A1):​c.651+179A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.265 in 152,062 control chromosomes in the GnomAD database, including 5,525 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency: Genomes: 𝑓 0.26 (5525 hom., cov: 33)
• Consequence: COL4A1 NM_001845.6 intron
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.0430
• Publications: 2 publications found

Genes affected

COL4A1 (HGNC:2202): (collagen type IV alpha 1 chain) This gene encodes a type IV collagen alpha protein. Type IV collagen proteins are integral components of basement membranes. This gene shares a bidirectional promoter with a paralogous gene on the opposite strand. The protein consists of an amino-terminal 7S domain, a triple-helix forming collagenous domain, and a carboxy-terminal non-collagenous domain. It functions as part of a heterotrimer and interacts with other extracellular matrix components such as perlecans, proteoglycans, and laminins. In addition, proteolytic cleavage of the non-collagenous carboxy-terminal domain results in a biologically active fragment known as arresten, which has anti-angiogenic and tumor suppressor properties. Mutations in this gene cause porencephaly, cerebrovascular disease, and renal and muscular defects. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2014]

COL4A1 Gene-Disease associations (from GenCC):

• brain small vessel disease 1 with or without ocular anomalies

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: G2P, Ambry Genetics, PanelApp Australia, Orphanet, Genomics England PanelApp
• autosomal dominant familial hematuria-retinal arteriolar tortuosity-contractures syndrome

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, Ambry Genetics
• microangiopathy and leukoencephalopathy, pontine, autosomal dominant

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• familial porencephaly

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• pontine autosomal dominant microangiopathy with leukoencephalopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• retinal arterial tortuosity

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• muscular dystrophy-dystroglycanopathy, type A

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.93).
• BP6: Variant 13-110209213-T-C is Benign according to our data. Variant chr13-110209213-T-C is described in ClinVar as Benign. ClinVar VariationId is 1265787.Status of the report is criteria_provided_single_submitter, 1 stars.
• BA1: GnomAd4 highest subpopulation (AMR) allele frequency at 95% confidence interval = 0.312 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL4A1	NM_001845.6	c.651+179A>G		intron_variant	Intron 11 of 51	ENST00000375820.10	NP_001836.3
COL4A1	NM_001303110.2	c.651+179A>G		intron_variant	Intron 11 of 24		NP_001290039.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL4A1	ENST00000375820.10	c.651+179A>G		intron_variant	Intron 11 of 51	1	NM_001845.6	ENSP00000364979.4

Frequencies

GnomAD3 genomes AF: 0.265 AC: 40192 AN: 151944 Hom.: 5517 Cov.: 33

Gnomad AFR AF: 0.269

Gnomad AMI AF: 0.0658

Gnomad AMR AF: 0.319

Gnomad ASJ AF: 0.244

Gnomad EAS AF: 0.0459

Gnomad SAS AF: 0.212

Gnomad FIN AF: 0.320

Gnomad MID AF: 0.241

Gnomad NFE AF: 0.266

Gnomad OTH AF: 0.228

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.265 AC: 40236 AN: 152062 Hom.: 5525 Cov.: 33 AF XY: 0.266 AC XY: 19776 AN XY: 74332

African (AFR) AF: 0.269 AC: 11170 AN: 41464

American (AMR) AF: 0.319 AC: 4875 AN: 15272

Ashkenazi Jewish (ASJ) AF: 0.244 AC: 846 AN: 3466

East Asian (EAS) AF: 0.0457 AC: 237 AN: 5190

South Asian (SAS) AF: 0.213 AC: 1026 AN: 4824

European-Finnish (FIN) AF: 0.320 AC: 3380 AN: 10558

Middle Eastern (MID) AF: 0.245 AC: 72 AN: 294

European-Non Finnish (NFE) AF: 0.266 AC: 18095 AN: 67976

Other (OTH) AF: 0.226 AC: 475 AN: 2106

Alfa AF: 0.270 Hom.: 1980

Bravo AF: 0.262

Asia WGS AF: 0.133 AC: 463 AN: 3476

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

Jun 29, 2018

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.93
CADD	Benign	3.4
DANN	Benign	0.62
PhyloP100		0.043
Mutation Taster		=100/0	polymorphism (auto)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs7333008; hg19: chr13-110861560;